One mole of carbon has a mass of 12 grams. One mole of sulfur has a mass of 32 grams. Why does one mole of each element not have the same mass? The samples contain the same number of particles, but carbon atoms have greater mass than sulfur atoms.
The samples contain the same number of particles, but carbon atoms have greater mass than sulfur atoms.

The samples contain the same number of particles, but sulfur atoms have greater mass than carbon atoms.
The samples contain the same number of particles, but sulfur atoms have greater mass than carbon atoms.

The sulfur sample contains fewer atoms, but sulfur atoms have greater mass than carbon atoms.
The sulfur sample contains fewer atoms, but sulfur atoms have greater mass than carbon atoms.

The carbon sample contains fewer atoms, but carbon atoms have greater mass than sulfur atoms.

Astudent made a graph plotting the progress of a reaction over time. the student forgot to label the y-axis of the graph. a graph is shown with two graph lines. one graph line starts at a higher position on the y axis and slopes downwards towards the right. the other graph line starts at a lower position on the y axis and slopes upwards towards the right. the two graph lines stop short of intersecting each other and continue as separate lines which gradually become straight and parallel to the x axis. a vertical line is shown at a point where the two graph lines finally became parallel to the x axis. this vertical line is labeled equilibrium. the title on the x axis is time and an arrow pointing towards the right is shown above time. the title on the y axis is left blank. what best explains the label that the student should use on the y-axis? amount, because as the amount of product decreases, the amount of reactant increases over time. reaction rate, because forward and backward reaction become equal at equilibrium. amount, because the amounts of reactants and products become constant after equilibrium is reached. reaction rate, as the rate of forward reaction increases and rate of backward reaction decreases over time.

Ican determine the molar mass of an element by looking on the under the atomic mass for the element. for example the molar mass of phosphorus is 30.974 grams/mole. avogadro’s number tells me the amount of representative particles in 1 mole of any substance. this means 12.011 gram sample of carbon and a 32.0 gram sample of sulfur have the same number of atoms.

Marcel just purchased 1.69 grams of iron fillings in order to make living putty for his 6 year old niece. how many moles of iron are made in his sample?